They got MS Edge like vertical tabs going, which after also using for nearly a year now I will say should be the default setup on wide/desktop formats.

We got more horizontal space than vertical in 16:9 and so on, so it maks no sense to have a second horizontal bar taking up precious vertical space when we can trivially use vertical tabs to use up the abundant space instead. More so because most websites use only a tiny fraction of the horizontal space in their layout anyways (case in point, Lemmy renders the same width whether I got vertical tabs or not).

Ever since MS Edge came out I’ve been looking for this in other browsers, and at least in Firefox I can do it myself, I just wish it was an official thing.